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Saturday, 7 May 2011

Delambre Taylor and Dollond craters

Photographer: Victor Lupu
Optics: Celestron C8-Newtonian reflector telescope, plossl 20mm, 2x Barlow
Mount: CG5 (EQ5)
Device: Sony HDR CX105
Filter: No
Date: 10/02/2011
Location: Baia Mare, Romania
Processing: video captures

        Delambre (52 km), is a large-edged crater- left in the photo.The floor remains much smaller than the margins.The name is from a mathematician astronomer Delambre.West of Delambre crater (look on cardinal points of the photo), there are two craters of about the same size, Theon Senior (18 km) and Theon Junior (19 km).
Theon Theon Senior and Junior (18 km-19 km) craters are circular in shape like a bowl, with a low floor in its center and steep walls inside. Depth at the edge to the floor is up to 3470 meters on Theon Senior , and 3580 meters on Theon Junior. Theon Senior and Junior dates back to Eratosthenian era 3.2 - 1.1 billion years ago.
The name of Theon Senior comes from Theon of Smyrna who was a Greek philosopher and mathematician, whose works were heavily influenced by the Pythagorean school of thought.
The name of the crater Theon Junior comes from Theon of Alexandria, a Greek mathematician who lived in Alexandria, Egypt.
Taylor (41x34 km), is a lunar crater that is located south of the Delambre crater. To the east is Alfraganus (21 km) below, and south-east is Zöllner (47x36 km).
Taylor's outer edge is elongated in north and south, giving it an elliptical appearance. There is a gap in the north wall, forming a narrow valley and the south side is relatively low compared with the high margins along the east and west. Taylor A and B (38 and 29 km) craters,are located in the west of Taylor.The name comes from Brook Taylor (18 August 1685 - 30 November 1731), a mathematician best known for the Taylor's theorem.
Dollond (11 km), is a small crater north of the crater Abulfeda. West of Dollond is Andel. Dollond is circular and conical in shape, with a low floor, and the interior walls are inclined.
At about 50 km northeast of the crater was the site of the Apollo 16 mission.
John Dollond (June 10 1706 - 30 November 1761) has the name of this crater. He was an English optician, known for his business success in selling optical achromatic doublets.

Andel (35 km). The outer edge of the eroded crater Andel was distorted into a polygonal shape, almost nonexistent in the south, where Andel G intersects the perimeter. The interior is nearly flat, with some south-east elevation. The crater was named after Karel Andel (28 December 1884-17 Mar 1947) who was a czech astronomer and selenographer.


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